feat: add processor state machine and alert mechanism

- Add ProcessorJobStatus enum (8 states: Idle/Waiting/Ready/Pending/Running/Completed/Failed/Skipped)
- Add processor_alerts table (migrations/034)
- Add emit_processor_alert() to redis_client.rs
- Add ConditionResult enum + check_dependencies() to job_worker.rs

migrations/034_processor_state_machine.sql

@@ -0,0 +1,23 @@
+-- Migration: 034_processor_state_machine
+-- Purpose: Add processor_alerts table for State Machine alert mechanism
+-- Date: 2026-05-30
+
+-- Create processor_alerts table
+CREATE TABLE IF NOT EXISTS processor_alerts (
+    id SERIAL PRIMARY KEY,
+    file_uuid VARCHAR(32),
+    processor_type VARCHAR(32) NOT NULL,
+    alert_type VARCHAR(32) NOT NULL,
+    message TEXT,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- Create indexes for efficient querying
+CREATE INDEX IF NOT EXISTS idx_alerts_file_uuid ON processor_alerts(file_uuid);
+CREATE INDEX IF NOT EXISTS idx_alerts_processor_type ON processor_alerts(processor_type);
+CREATE INDEX IF NOT EXISTS idx_alerts_alert_type ON processor_alerts(alert_type);
+CREATE INDEX IF NOT EXISTS idx_alerts_created_at ON processor_alerts(created_at);
+
+-- Add comments
+COMMENT ON TABLE processor_alerts IS 'Processor state machine alerts for dependency/resource/output issues';
+COMMENT ON COLUMN processor_alerts.alert_type IS 'Alert types: dependency_not_met, resource_exhausted, output_invalid, timeout';